<template>
  <div>
    <div class="search" v-if="user.role!=='STUDENT'">
      <el-input placeholder="请输入账号查询" style="width: 200px" v-model="username"></el-input>
      <el-button type="info" plain style="margin-left: 10px" @click="load(1)">查询</el-button>
      <el-button type="warning" plain style="margin-left: 10px" @click="reset">重置</el-button>
    </div>

    <div class="operation" v-if="user.role!=='STUDENT'">
      <el-button type="primary" plain @click="handleAdd">新增</el-button>
      <el-button type="danger" plain @click="delBatch">批量删除</el-button>
    </div>

    <div class="table">
      <el-table :data="tableData" strip @selection-change="handleSelectionChange">
        <el-table-column type="selection" width="55" align="center" v-if="user.role!=='STUDENT'"></el-table-column>
        <el-table-column prop="id" label="序号" width="70" align="center" sortable v-if="user.role!=='STUDENT'"></el-table-column>
        <el-table-column label="头像">
          <template v-slot="scope">
            <div style="display: flex; align-items: center">
              <el-image style="width: 40px; height: 40px; border-radius: 50%" v-if="scope.row.avatar"
                        :src="scope.row.avatar" :preview-src-list="[scope.row.avatar]"></el-image>
            </div>
          </template>
        </el-table-column>
        <el-table-column prop="username" label="账号"></el-table-column>
        <el-table-column prop="name" label="姓名"></el-table-column>
        <el-table-column prop="role" label="角色"></el-table-column>
        <el-table-column prop="collegeName" label="学院"></el-table-column>
        <el-table-column prop="specialityName" label="专业"></el-table-column>
        <el-table-column prop="className" label="班级"></el-table-column>
        <el-table-column label="操作" align="center" width="180">
          <template v-slot="scope">
            <el-button size="mini" type="primary" plain @click="handleEdit(scope.row)">编辑</el-button>
            <el-button size="mini" type="danger" plain @click="del(scope.row.id)">删除</el-button>
          </template>
        </el-table-column>
      </el-table>

      <div class="pagination">
        <el-pagination
                background
                @current-change="handleCurrentChange"
                :current-page="pageNum"
                :page-sizes="[5, 10, 20]"
                :page-size="pageSize"
                layout="total, prev, pager, next"
                :total="total">
        </el-pagination>
      </div>
    </div>


    <el-dialog title="学生信息" :visible.sync="fromVisible" width="40%" :close-on-click-modal="false" destroy-on-close>
      <el-form :model="form" label-width="100px" style="padding-right: 50px" :rules="rules" ref="formRef">
        <el-form-item label="头像">
          <el-upload
                  class="avatar-uploader"
                  :action="$baseUrl + '/files/upload'"
                  :headers="{ token: user.token }"
                  list-type="picture"
                  :on-success="handleAvatarSuccess"
          >
            <el-button type="primary">上传头像</el-button>
          </el-upload>
        </el-form-item>
        <el-form-item label="用户名" prop="username">
          <el-input v-model="form.username" placeholder="用户名"></el-input>
        </el-form-item>
        <el-form-item label="姓名" prop="name">
          <el-input v-model="form.name" placeholder="姓名"></el-input>
        </el-form-item>
        <el-form-item label="学院" prop="collegeId">
          <el-select v-model="form.collegeId" placeholder="请选择学院"  @change="loadSpeciality()" style="width: 100%">
            <el-option v-for="item in collegeData" :label="item.name" :value="item.id"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="专业" prop="specialityId">
          <el-select v-model="form.specialityId" placeholder="请选择专业"  @change="loadClasses()"style="width: 100%">
            <el-option v-for="item in specialityData" :label="item.name" :value="item.id"></el-option>
          </el-select>
        </el-form-item>
        <el-form-item label="班级" prop="classesId">
          <el-select v-model="form.classId" placeholder="请选择班级" style="width: 100%" >
            <el-option v-for="item in classesData" :label="item.name" :value="item.id"></el-option>
          </el-select>
        </el-form-item>
      </el-form>

      <div slot="footer" class="dialog-footer">
        <el-button @click="fromVisible = false">取 消</el-button>
        <el-button type="primary" @click="save">确 定</el-button>
      </div>
    </el-dialog>


  </div>
</template>

<script>
  export default {
    name: "Student",
    data() {
      return {
        tableData: [],  // 所有的数据
        pageNum: 1,   // 当前的页码
        pageSize: 10,  // 每页显示的个数
        total: 0,
        username: null,
        fromVisible: false,
        form: {},
        user: JSON.parse(localStorage.getItem('xm-user') || '{}'),
        rules: {
          username: [
            {required: true, message: '请输入账号', trigger: 'blur'},
          ]
        },
        ids: [],
        collegeData: [],
        specialityData: [],
        classesData: []
      }
    },
    created() {
      this.load(1)
      this.loadCollege()
    },
    methods: {
      loadCollege() {
        this.$request.get('/college/selectAll').then(res => {
          if (res.code ==='200') {
            this.collegeData = res.data
          } else {
            this.$message.error(res.msg)
          }
        })
      },
      loadSpeciality() {
        this.$request.get('/speciality/selectById/'+this.form.collegeId).then(res => {
          if (res.code === '200') {
            this.specialityData = res.data
          } else {
            this.$message.error(res.data)
          }
        })
      },
      loadClasses() {
        this.$request.get('/classes/selectById/'+this.form.specialityId).then(res => {
          if (res.code === '200') {
            this.classesData = res.data
          } else {
            this.$message.error(res.data)
          }
        })
      },
      handleAdd() {   // 新增数据
        this.form = {}  // 新增数据的时候清空数据
        this.fromVisible = true   // 打开弹窗
      },
      handleEdit(row) {   // 编辑数据
        console.log(JSON.parse(JSON.stringify(row))["className"] )
        this.form = JSON.parse(JSON.stringify(row))  // 给form对象赋值  注意要深拷贝数据
        this.form.specialityId = JSON.parse(JSON.stringify(row))["specialityName"]
        this.form.classId = JSON.parse(JSON.stringify(row))["className"]
        this.fromVisible = true   // 打开弹窗
      },
      save() {   // 保存按钮触发的逻辑  它会触发新增或者更新
        this.$refs.formRef.validate((valid) => {
          if (valid) {
            this.$request({
              url: this.form.id ? '/student/update' : '/student/add',
              method: this.form.id ? 'PUT' : 'POST',
              data: this.form
            }).then(res => {
              if (res.code === '200') {  // 表示成功保存
                this.$message.success('保存成功')
                this.load(1)
                this.fromVisible = false
              } else {
                this.$message.error(res.msg)  // 弹出错误的信息
              }
            })
          }
        })
      },
      del(id) {   // 单个删除
        this.$confirm('您确定删除吗？', '确认删除', {type: "warning"}).then(response => {
          this.$request.delete('/student/delete/' + id).then(res => {
            if (res.code === '200') {   // 表示操作成功
              this.$message.success('操作成功')
              this.load(1)
            } else {
              this.$message.error(res.msg)  // 弹出错误的信息
            }
          })
        }).catch(() => {
        })
      },
      handleSelectionChange(rows) {   // 当前选中的所有的行数据
        this.ids = rows.map(v => v.id)
      },
      delBatch() {   // 批量删除
        if (!this.ids.length) {
          this.$message.warning('请选择数据')
          return
        }
        this.$confirm('您确定批量删除这些数据吗？', '确认删除', {type: "warning"}).then(response => {
          this.$request.delete('/student/delete/batch', {data: this.ids}).then(res => {
            if (res.code === '200') {   // 表示操作成功
              this.$message.success('操作成功')
              this.load(1)
            } else {
              this.$message.error(res.msg)  // 弹出错误的信息
            }
          })
        }).catch(() => {
        })
      },
      load(pageNum) {  // 分页查询
        if (pageNum) this.pageNum = pageNum
        this.$request.get('/student/selectPage', {
          params: {
            pageNum: this.pageNum,
            pageSize: this.pageSize,
            username: this.username,
          }
        }).then(res => {
          this.tableData = res.data?.list
          this.total = res.data?.total
        })
      },
      reset() {
        this.username = null
        this.load(1)
      },
      handleCurrentChange(pageNum) {
        this.load(pageNum)
      },
      handleAvatarSuccess(response, file, fileList) {
        // 把头像属性换成上传的图片的链接
        this.form.avatar = response.data
      },
    }
  }
</script>

<style scoped>

</style>